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Main breaker one side "24." Amp other side "10.3" Amp

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  • mikeb103 May 11, 2010

    What is your question? Are you concerned the two are different?

  • Hippy_dd May 11, 2010

    what is the breaker protecting?

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  • 25 Answers

Please clarify if it's a boat, RV or a home breaker
Do you have a manufactures name?
Just looking at the data you gave It's a 24 volt 10.3 amp breaker that is used on anything other than a home appliance
I don't know if it's 24 volts AC ,24 volts DC or a universal 24 volt breaker

Posted on Oct 09, 2009

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1 Answer

5000 watt inverter schematics circuit


If you have (90) 50w lamps = 4500 watts total. Assuming a 120/240 panel, if you put 1/2 on one "side" of the panel and the other 1/2 on the other "side" of the panel, that would be 2250 watts on each half. The generator should be rated *at least* 125% of the load; 4500w x 1.25 = 5625W. Using a 4500W generator on this load will cause it to overheat and shorten its life as it is running at 100% of capacity all the time..

One half of the panel is 120V to neutral, and the other is 120V to neutral - or 240V between both circuit breaker terminals. Ohms law for DC circuits and purely resistive AC circuits says Volts x Amps = Watts; or Watts / Volts = Amps. So, 2250W / 120V = 18.75A on each pole of a 2 pole circuit breaker that feeds the sub panel. A #12 copper wire is rated for 20 amps; but as per National Electrical Code - must be de-rated to 80% of rating which means it is good up to 16 amps maximum. A #10 copper wire is rated for 30 amps, but it too must be derated to 80%, making it good for 24 amps maximum. So, if you are going to feed a sub panel supplying (90) 50watt lamps, you will need to run a #10/3 copper cable from a two pole 30 amp circuit breaker at the generator to a 120/240 volt "main lug only" sub panel rated for at least 30 amps.

Divide your load evenly across the sub panel - (4) 15 amps circuits via (2) two pole 15 amp circuit breakers on each "side" of the panel if you run (2) 14/3 cables out to the lights - or (4) single pole 15 amp circuit breakers if you run (4) 14/2 cables out to the lights. No circuit breaker terminal should have more than 23 lamps that means you have (2) w/ 22 lamps and (2) with 23 lamps. The circuit w/ 23 lamps will draw 23 lamps x 50w = 1150W. 1150W / 120V = 9.6A. The 22 lamp load will be 22 x 50w = 1100W. 110W / 120V = 9.2A. Which is well within the 12A maximum allowed (after derating as required by code) by a #14 copper wire rated for 15A.

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1 Answer

I purchased a 7000W Westinghouse Portable Generator to back feed my circuit breaker box. The cable is rated to 30amps. Do I use a 30 amp or a 40 amp circuit breaker? Thanks, Mike


1) Match wire and breaker:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/See-inside-main-breaker-box.html

2) 7000 watts divided by 240 volts = 29.1 amps.
30 amp breaker x 80% safe maximum = 24 amps.
This means you should use 8 gauge wire and 40 amp double pole breaker for 240volt

3) 7000 watts divided by 120 volt = 58.3 amps.
60 amp breaker x 80% safe maximum = 48 amps.
So use 70 amp breaker and #4 wire.

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Hi Anonymous, you have a hard/dead short that should be easy to find generally they are the easiest. Time to get out your test light and start tracking the wire from the power side of the switch, circuit breaker or the blown fuse receiver, when the test light quits lighting you are very close to your short. For a free wiring diagram please visit the website below and good luck.
Harley Davidson Wiring Diagrams and Schematics

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To be very safe, turn OFF your Main circuit breaker prior to doing this. This IS really important! You asked how to hook up the breaker, so I'm going to assume you already installed this. The first wire that you'll want to land under a screw is your ground (green) wire. This wire should be where all your ground/green wires are. Next, you're going to bring your white (neutral) wire to the neutral bar.  You should see other white wire's terminated (attached under screws) there. Then, bring your colored (ie usually a black or red) wire and attach it to your circuit breaker. Make sure that you are using a #10 guage wire. This wire guage is rated for 30 amps. If you're using a 20 amp circuit breaker, then use a #12 guage wire. And a #14 guage wire for 15 amp circuit breaker. Using these wire guages satisfy all electrical requirements (codes). Now, leave the circuit breaker in the OFF position, and close up your panel. After closing it, then turn ON your Main circuit breaker. If everything is fine, great! Before you turn on your circuit breaker, make sure the switch, device, receptacle (unplugged), is OFF. Then go to your electric panel and turn ON the circuit breaker. If the breaker holds (doesn't trip), then try your switch, device, or receptacle to see if everything works. One last thing to remember is, if you're using a 30 amp circuit breaker, then the device on the other end should only draw up to 24 amps. Meaning, don't put a 30 amp cir. brkr. on a 20 amp recectacle, switch, or device. For a 20 amp cir. brkr., 16 amps is the maximum load you can put on this. I hope this helps you. Just read it through once, and then highlight the main parts of this and you should do fine. Good Luck, and feel free to contact me if you'd like further assistance. - Jim

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Cavity
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